Automatic gun.



No. 821,922. PATENTED MAY 29, 1906.

A. BURGESS.

AUTOMATIC GUN.

APPLIGATION FILED Now/24, 1904.

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' To all whom it may concern:

Beit known that I, ANDREW BURGEss,a citi- 4ANDREW BURGESS, OF OWEGO, NEW YORK.

AUTOMATIC GUN.

Specification of Letters Patent.

katented May 29, 1906.

Application filed November 4, 1904. Serial NO- 231.424. I

zen of the United States, residing at Owego, in the county of Tioga and State of New York, have invented certain new and useful Improvements in Automatic Guns, of which the following is a specification. y

This invention relates to automatic firearms.

The object of the invention is to produce a compact and simple gun. A pistol is illustrated; but the invention is applicable to other firearms.

The invention consists in a construction wherebya breech-pin and sliding casing may be easily assembled with a frame and fixed barrel also, in the combination with a reciprocating breech ofan inertia-brake or re tarder; also, in improved constructionsand combinations whereby the firing of the weapon is accomplished; also, in details hereinafter described and claimed.

Figure 1 isa side elevation of a istol involving this invention, part of the ame being broken away. Fig. 2 is a vertical lon itudinal section showing the inertia bra e slightly modified.- Fig.'3, is a broken longitudinalfsection of Fig. 1, parts being omitted. Fig. 4 is a cross-section on line a: :c of Fig. 3 looking toward the front of the firearm.

The numeral l1 indicates the frame of the firearm, and 2 the barrel, which is ri id with said frame,` being preferably attac ed by the screw-thread 3. The casing 4 is a shell of a generally cylindrical form, but is cut away at its under side along its rear portion to a width which will pass the reduced portion of the barrel.v The breech-piece 5 is rigid with the casing 4 and may either be integral therewith, as shown in Fig. 2, or may be attached ihereto by suitable coupling means, as in The breech-closing spring 6 surrounds the barrel and has its bearings against a shoulder on the barrel at its rear end and against the inturned front end of the casing. In assembling the spring 6 is passed over the barrel, and then t e casin is slightly tilted and its inturned end passe over-the barrel until the breech-piece 5 passes the breech of the barrel, when the breechiece is swun down,

so that it comes behind t e barrel, an brakepiece 10, when attached, will confine it lfrom rising. Then a backward movement of the breech-piece 5 in the housing 8 draws back rear part.

ed into the span between the breech-piece 5 y c.

and the barrel when the breechiece is thrown back by the recoil, as usu'a in this class of firearms.

The inertia brake-piece or retarder 10 `is pivoted to the housing 8 by m11, as shown in Figs. 1, 3, and 4, the top o the housing being s otted longitudinally or cut away at its The inertia brake-piece 10 has a projection 12 extending down into'the path of the breech-piece 5. This projection 12 is inclined at its front and rear ends. When the breech-piece recoils, it must throw down the( heavy rear end of the inertia-piece -10 against the resistance of spring 15 said piece turning on pivot 11. As the breech-piece moves still farther back its up er corner encounters the incline on the epressed inertia-piece and lifts it, the depression 13 in the breech-piece at that time having obtained position for receiving the projection 12 of the inertiaiece. The forward movement of the breec -piece again depresses the rear end-orlong arm of inertia-piece 10 by the engagement' of depression 13 in the breechiece with rejection 12 on the forward s ort end of the inertia-piece, thus again retarding the forward movement of the breech-piece, so that more time is given for the cartridge-feed. The mains ring 15 bears against an inturned end 21 of t e hammer 20 and against a suitable support on the inertiapiece behind and below the pivot 11. The mainspring thus has a tendency to lift the rear end of the inertia-piece, aswell asA to force the hammer forward. The hammer 2O has a thumb-piece 53 and a head 21, against which the mainspring bears, as explained, and also has a bar 22 with offset around the magazine and extending forward. When the hammer is cocked, either by hand by a backward pull or by the recoil of the breechpiece 5, the Sear 25 swings up in front of bar 22 to hold thegha'mmer cocked. Sear 25 is pivoted at 26 arid pressed up by spring 27.

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A dog 28 is pivot 26 and las an arm 29, Which is pressed up by s ring 30, which'spring bears on the sear an dog. The trigger 33 is ressed by spring 34 into engagement with t e hooked end of dog 28, the end of said dog being inclined to let the nose of the trigger ride past. When so engaged, a pull on the trigger draws on dog 28, thus depressing sear and releasing the hammer. As the hammer slides forward under impulse of the mains ringvl the rojection 23 strikes arm 29 o dog 28l and ocks the hooked end of said dog away from the trigger. The sear is then free to rise and engage the hammer and will do so When the hammer comes back whether the trigger is released or not. When the pull on the trilglger is relieved, its front arm rises and again ooks into engagement with the seardog. The ring-pin 36 is located in the breech-piece, as is very common, and operates as usual. A grip-piece 40 is pivoted to the frame near the lower part of the stock and is pressed outward by s ring 41. A safety-catch 42 is pivoted to the frame and is also loosely ivoted to recoil-shield 40. The head of the ammer 20 is so formed as to ride over catch 42 when the hammer is cocked; but the spring-pressed recoil-piece 40 turns catch 42 to position to detain the hammer in cocked position, except when piece 40 is pressed in, as by a grip of the hand, when catch 42 is turned down out of the way of the hammer and ceases to act as a detent therefor.

In the modification shown in Fig. 2 the inertia-piece is pivoted at 51 and'its heavy end extends forward instead of rearward, and its short arm brakes under the shell 52 of the frame. In other respects the operation is like that of the piece 10 described.

ivoted to the sear in rear ofA and rearwardly-moving breech-piece, of aV brake-piece pivoted to the frame, and having a short arm acted lon by the backwardly-moving breech-piece, a long arm which is thereby rocked into the path of movement of the breech-piece, said breech-piece having a deression. into which the short arm of the Brake is rocked, to retard the breech-closing movement.

4. In a firearm, a hammer, a sear pivoted in the frame, a trigger separately pivoted in the frame, a dog pivoted to the sear and having a hook with which the trigger engages and by which the sear is released from the hammer, Sai-d dog extending into the path of movement of the hammer and being released from the trigger by the striking movement of the hammer, all combined substantially as described.

In testimony whereof I affix my signature in presence of two Witnesses.

ANDREW BURGESS.

Witnesses:

W. A. BARTLETT, E. H. PARKINS. 

